/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2017                                                               *
 *                                                                                       *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
 * software and associated documentation files (the "Software"), to deal in the Software *
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 * The above copyright notice and this permission notice shall be included in all copies *
 * or substantial portions of the Software.                                              *
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 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
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 ****************************************************************************************/

#include <modules/globebrowsing/other/distanceswitch.h>
#include <openspace/rendering/renderable.h>
#include <openspace/util/updatestructures.h>

namespace openspace::globebrowsing {

DistanceSwitch::~DistanceSwitch() {}

bool DistanceSwitch::initialize() {
    for (unsigned int i = 0; i < _renderables.size(); ++i) {
        _renderables[i]->initialize();
    }
    return true;
}

bool DistanceSwitch::deinitialize() {
    for (unsigned int i = 0; i < _renderables.size(); ++i) {
        _renderables[i]->deinitialize();
    }
    return true;
}

void DistanceSwitch::render(const RenderData& data, RendererTasks& tasks) {
    const double distanceToCamera =
        distance(data.camera.positionVec3(), data.modelTransform.translation);

    // This distance will be enough to render the globe as one pixel if the field of
    // view is 'fov' radians and the screen resolution is 'res' pixels.
    const double fov = 2 * glm::pi<double>() / 6; // 60 degrees
    int res = 2880;
        
    // linear search through nodes to find which Renderable to render
    for (std::shared_ptr<Renderable> renderable : _renderables) {
        const double distance = res * renderable->boundingSphere() / tan(fov / 2);
        if (distanceToCamera < distance) {
            renderable->render(data, tasks);
        }
    }
}

void DistanceSwitch::update(const UpdateData& data) {
    for (std::shared_ptr<Renderable> renderable : _renderables) {
        renderable->update(data);
    }
}

void DistanceSwitch::addSwitchValue(std::shared_ptr<Renderable> renderable) {
    _renderables.push_back(renderable);
}

} // namespace openspace::globebrowsing